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Summary of Quarterly Results of Operations (Unaudited) - Narrative - Significant Items for Fiscal 2015 (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 03, 2015
May. 02, 2015
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Segment Reporting Information [Line Items]          
Goodwill impairment charge     $ 11.1 $ 0.0 $ 4.3
Malta | Foreign tax authority          
Segment Reporting Information [Line Items]          
Valuation allowance, deferred tax asset   $ 5.0      
Trace Laboratories          
Segment Reporting Information [Line Items]          
Pre-tax gain on sale $ 7.7 7.7      
Interface          
Segment Reporting Information [Line Items]          
Goodwill impairment charge     11.1 $ 0.0 $ 0.0
TouchSensor | Interface          
Segment Reporting Information [Line Items]          
Goodwill impairment charge   $ 11.1 $ 11.1